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IPC Subgroup
H04N 9/44

Colour synchronisation

Introduced: September 1968

Last revised: January 2006

Full Title

Details of colour television systems > Colour synchronisation

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
PICTORIAL COMMUNICATION, e.g. TELEVISION

5 direct subcodes

Child Classifications

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  • H04N 9/45 Generation or recovery of colour sub-carriers
  • H04N 9/455 Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
  • H04N 9/465 Synchronisation of the PAL-switch
  • H04N 9/47 for sequential signals
  • H04N 9/475 for mutually locking different synchronisation sources

Top Applicants

Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 97,396
  2. HUAWEI TECHNOLOGIES COMPANY CN 96,502
  3. SAMSUNG ELECTRONICS COMPANY KR 86,981
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
  5. HUAWEI TECHNOLOGIES COMPANY 55,349
  6. LG ELECTRONICS KR 53,649
  7. CANON 33,341
  8. SONY CORPORATION JP 32,761
  9. ZTE CORPORATION CN 32,274
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327